Share 'First Season'

Well, it looks like Bess has started her first season.  As its the first for me as well (I've only owned dogs before), is there a general length of time a season is likely to last in setters, or does it depend on the individual dog?  Without getting too gory I think there may have been a clear discharge starting last Thursday (it looked as if she'd been sitting on wet grass), but the vulva has sw…